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在拉了这么多头发想弄清楚这件事后，我几乎秃顶了。我正在尝试使用 avFoundation 拍摄照片，但方向几乎总是一团糟。我的 ViewWillAppear 中有以下函数来捕获设备方向：

- (void)deviceOrientationDidChange { 
  UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];

  if (deviceOrientation == UIDeviceOrientationPortrait)
    orientation = AVCaptureVideoOrientationPortrait;
  else if (deviceOrientation == UIDeviceOrientationPortraitUpsideDown)
    orientation = AVCaptureVideoOrientationPortraitUpsideDown;
  // AVCapture and UIDevice have opposite meanings for landscape left and right (AVCapture orientation is the same as UIInterfaceOrientation)
  else if (deviceOrientation == UIDeviceOrientationLandscapeLeft)
    orientation = AVCaptureVideoOrientationLandscapeRight;
  else if (deviceOrientation == UIDeviceOrientationLandscapeRight)
    orientation = AVCaptureVideoOrientationLandscapeLeft;

// Ignore device orientations for which there is no corresponding still image orientation (e.g. UIDeviceOrientationFaceUp)
}

此代码似乎工作正常并捕获了正确的方向。然后我运行以下代码来生成图像：

    [myConnection setVideoOrientation:self.orientation];
    //THIS IS THE CORRECT ORIENTATION
    NSLog(@"ORIENTATION %d",myConnection.videoOrientation);

[self.stillOutput captureStillImageAsynchronouslyFromConnection:myConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error)
 {
         if (imageSampleBuffer != nil) {
         NSData *jpeg = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer]; //jpeg image in binary format

         UIImage *image = [[UIImage alloc] initWithData:jpeg];

         NSLog(@"IMAGE ORIENTATION: %d", image.imageOrientation);

         postProcessingBlock(image, mutable);

         [mutable release];
         [image release];
     }
     else {
         NSLog(@"AVCapture ERROR:%@", [error localizedDescription]);
     }
 }];

当我使用后置摄像头（按下按钮）以纵向模式拍照时，我的日志显示：

ORIENTATION 1
IMAGE ORIENTATION 3

我究竟做错了什么？为什么它向我显示错误的方向？

谢谢！

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1 回答 1

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不知道你是否明白这一点，但你没有做错任何事。需要注意的是，AVCaptureVideoOrientation实际上UIImageOrientation是指不同的方向！

UIImageOrientationUp实际上是指横向模式下的设备，音量控件指向地面。UIImageOrientationLeft电源按钮指向天空的人像照片的正确方向也是如此。

于 2015-06-15T18:12:43.960 回答